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303 lines
9.6 KiB
C++
303 lines
9.6 KiB
C++
//===-- sanitizer_allocator_primary32.h -------------------------*- C++ -*-===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Part of the Sanitizer Allocator.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_ALLOCATOR_H
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#error This file must be included inside sanitizer_allocator.h
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#endif
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template<class SizeClassAllocator> struct SizeClassAllocator32LocalCache;
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// SizeClassAllocator32 -- allocator for 32-bit address space.
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// This allocator can theoretically be used on 64-bit arch, but there it is less
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// efficient than SizeClassAllocator64.
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//
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// [kSpaceBeg, kSpaceBeg + kSpaceSize) is the range of addresses which can
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// be returned by MmapOrDie().
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//
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// Region:
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// a result of a single call to MmapAlignedOrDie(kRegionSize, kRegionSize).
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// Since the regions are aligned by kRegionSize, there are exactly
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// kNumPossibleRegions possible regions in the address space and so we keep
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// a ByteMap possible_regions to store the size classes of each Region.
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// 0 size class means the region is not used by the allocator.
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//
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// One Region is used to allocate chunks of a single size class.
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// A Region looks like this:
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// UserChunk1 .. UserChunkN <gap> MetaChunkN .. MetaChunk1
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//
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// In order to avoid false sharing the objects of this class should be
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// chache-line aligned.
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template <const uptr kSpaceBeg, const u64 kSpaceSize,
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const uptr kMetadataSize, class SizeClassMap,
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const uptr kRegionSizeLog,
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class ByteMap,
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class MapUnmapCallback = NoOpMapUnmapCallback>
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class SizeClassAllocator32 {
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public:
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struct TransferBatch {
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static const uptr kMaxNumCached = SizeClassMap::kMaxNumCachedHint - 2;
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void SetFromArray(uptr region_beg_unused, void *batch[], uptr count) {
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count_ = count;
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CHECK_LE(count_, kMaxNumCached);
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for (uptr i = 0; i < count; i++)
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batch_[i] = batch[i];
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}
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uptr Count() const { return count_; }
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void Clear() { count_ = 0; }
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void Add(void *ptr) {
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batch_[count_++] = ptr;
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CHECK_LE(count_, kMaxNumCached);
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}
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void CopyToArray(void *to_batch[]) {
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for (uptr i = 0, n = Count(); i < n; i++)
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to_batch[i] = batch_[i];
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}
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// How much memory do we need for a batch containing n elements.
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static uptr AllocationSizeRequiredForNElements(uptr n) {
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return sizeof(uptr) * 2 + sizeof(void *) * n;
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}
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static uptr MaxCached(uptr class_id) {
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return Min(kMaxNumCached, SizeClassMap::MaxCachedHint(class_id));
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}
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TransferBatch *next;
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private:
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uptr count_;
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void *batch_[kMaxNumCached];
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};
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static const uptr kBatchSize = sizeof(TransferBatch);
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COMPILER_CHECK((kBatchSize & (kBatchSize - 1)) == 0);
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COMPILER_CHECK(sizeof(TransferBatch) ==
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SizeClassMap::kMaxNumCachedHint * sizeof(uptr));
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static uptr ClassIdToSize(uptr class_id) {
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return SizeClassMap::Size(class_id);
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}
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typedef SizeClassAllocator32<kSpaceBeg, kSpaceSize, kMetadataSize,
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SizeClassMap, kRegionSizeLog, ByteMap, MapUnmapCallback> ThisT;
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typedef SizeClassAllocator32LocalCache<ThisT> AllocatorCache;
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void Init() {
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possible_regions.TestOnlyInit();
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internal_memset(size_class_info_array, 0, sizeof(size_class_info_array));
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}
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void *MapWithCallback(uptr size) {
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size = RoundUpTo(size, GetPageSizeCached());
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void *res = MmapOrDie(size, "SizeClassAllocator32");
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MapUnmapCallback().OnMap((uptr)res, size);
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return res;
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}
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void UnmapWithCallback(uptr beg, uptr size) {
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MapUnmapCallback().OnUnmap(beg, size);
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UnmapOrDie(reinterpret_cast<void *>(beg), size);
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}
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static bool CanAllocate(uptr size, uptr alignment) {
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return size <= SizeClassMap::kMaxSize &&
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alignment <= SizeClassMap::kMaxSize;
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}
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void *GetMetaData(const void *p) {
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CHECK(PointerIsMine(p));
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uptr mem = reinterpret_cast<uptr>(p);
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uptr beg = ComputeRegionBeg(mem);
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uptr size = ClassIdToSize(GetSizeClass(p));
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u32 offset = mem - beg;
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uptr n = offset / (u32)size; // 32-bit division
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uptr meta = (beg + kRegionSize) - (n + 1) * kMetadataSize;
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return reinterpret_cast<void*>(meta);
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}
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NOINLINE TransferBatch *AllocateBatch(AllocatorStats *stat, AllocatorCache *c,
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uptr class_id) {
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CHECK_LT(class_id, kNumClasses);
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SizeClassInfo *sci = GetSizeClassInfo(class_id);
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SpinMutexLock l(&sci->mutex);
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if (sci->free_list.empty())
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PopulateFreeList(stat, c, sci, class_id);
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CHECK(!sci->free_list.empty());
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TransferBatch *b = sci->free_list.front();
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sci->free_list.pop_front();
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return b;
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}
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NOINLINE void DeallocateBatch(AllocatorStats *stat, uptr class_id,
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TransferBatch *b) {
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CHECK_LT(class_id, kNumClasses);
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SizeClassInfo *sci = GetSizeClassInfo(class_id);
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SpinMutexLock l(&sci->mutex);
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CHECK_GT(b->Count(), 0);
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sci->free_list.push_front(b);
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}
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uptr GetRegionBeginBySizeClass(uptr class_id) { return 0; }
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bool PointerIsMine(const void *p) {
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uptr mem = reinterpret_cast<uptr>(p);
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if (mem < kSpaceBeg || mem >= kSpaceBeg + kSpaceSize)
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return false;
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return GetSizeClass(p) != 0;
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}
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uptr GetSizeClass(const void *p) {
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return possible_regions[ComputeRegionId(reinterpret_cast<uptr>(p))];
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}
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void *GetBlockBegin(const void *p) {
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CHECK(PointerIsMine(p));
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uptr mem = reinterpret_cast<uptr>(p);
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uptr beg = ComputeRegionBeg(mem);
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uptr size = ClassIdToSize(GetSizeClass(p));
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u32 offset = mem - beg;
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u32 n = offset / (u32)size; // 32-bit division
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uptr res = beg + (n * (u32)size);
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return reinterpret_cast<void*>(res);
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}
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uptr GetActuallyAllocatedSize(void *p) {
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CHECK(PointerIsMine(p));
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return ClassIdToSize(GetSizeClass(p));
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}
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uptr ClassID(uptr size) { return SizeClassMap::ClassID(size); }
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uptr TotalMemoryUsed() {
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// No need to lock here.
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uptr res = 0;
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for (uptr i = 0; i < kNumPossibleRegions; i++)
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if (possible_regions[i])
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res += kRegionSize;
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return res;
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}
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void TestOnlyUnmap() {
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for (uptr i = 0; i < kNumPossibleRegions; i++)
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if (possible_regions[i])
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UnmapWithCallback((i * kRegionSize), kRegionSize);
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}
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// ForceLock() and ForceUnlock() are needed to implement Darwin malloc zone
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// introspection API.
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void ForceLock() {
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for (uptr i = 0; i < kNumClasses; i++) {
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GetSizeClassInfo(i)->mutex.Lock();
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}
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}
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void ForceUnlock() {
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for (int i = kNumClasses - 1; i >= 0; i--) {
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GetSizeClassInfo(i)->mutex.Unlock();
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}
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}
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// Iterate over all existing chunks.
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// The allocator must be locked when calling this function.
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void ForEachChunk(ForEachChunkCallback callback, void *arg) {
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for (uptr region = 0; region < kNumPossibleRegions; region++)
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if (possible_regions[region]) {
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uptr chunk_size = ClassIdToSize(possible_regions[region]);
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uptr max_chunks_in_region = kRegionSize / (chunk_size + kMetadataSize);
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uptr region_beg = region * kRegionSize;
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for (uptr chunk = region_beg;
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chunk < region_beg + max_chunks_in_region * chunk_size;
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chunk += chunk_size) {
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// Too slow: CHECK_EQ((void *)chunk, GetBlockBegin((void *)chunk));
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callback(chunk, arg);
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}
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}
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}
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void PrintStats() {
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}
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static uptr AdditionalSize() {
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return 0;
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}
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// This is empty here. Currently only implemented in 64-bit allocator.
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void ReleaseToOS() { }
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typedef SizeClassMap SizeClassMapT;
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static const uptr kNumClasses = SizeClassMap::kNumClasses;
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private:
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static const uptr kRegionSize = 1 << kRegionSizeLog;
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static const uptr kNumPossibleRegions = kSpaceSize / kRegionSize;
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struct SizeClassInfo {
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SpinMutex mutex;
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IntrusiveList<TransferBatch> free_list;
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char padding[kCacheLineSize - sizeof(uptr) -
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sizeof(IntrusiveList<TransferBatch>)];
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};
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COMPILER_CHECK(sizeof(SizeClassInfo) == kCacheLineSize);
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uptr ComputeRegionId(uptr mem) {
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uptr res = mem >> kRegionSizeLog;
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CHECK_LT(res, kNumPossibleRegions);
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return res;
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}
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uptr ComputeRegionBeg(uptr mem) {
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return mem & ~(kRegionSize - 1);
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}
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uptr AllocateRegion(AllocatorStats *stat, uptr class_id) {
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CHECK_LT(class_id, kNumClasses);
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uptr res = reinterpret_cast<uptr>(MmapAlignedOrDie(kRegionSize, kRegionSize,
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"SizeClassAllocator32"));
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MapUnmapCallback().OnMap(res, kRegionSize);
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stat->Add(AllocatorStatMapped, kRegionSize);
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CHECK_EQ(0U, (res & (kRegionSize - 1)));
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possible_regions.set(ComputeRegionId(res), static_cast<u8>(class_id));
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return res;
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}
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SizeClassInfo *GetSizeClassInfo(uptr class_id) {
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CHECK_LT(class_id, kNumClasses);
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return &size_class_info_array[class_id];
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}
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void PopulateFreeList(AllocatorStats *stat, AllocatorCache *c,
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SizeClassInfo *sci, uptr class_id) {
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uptr size = ClassIdToSize(class_id);
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uptr reg = AllocateRegion(stat, class_id);
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uptr n_chunks = kRegionSize / (size + kMetadataSize);
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uptr max_count = TransferBatch::MaxCached(class_id);
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TransferBatch *b = nullptr;
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for (uptr i = reg; i < reg + n_chunks * size; i += size) {
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if (!b) {
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b = c->CreateBatch(class_id, this, (TransferBatch*)i);
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b->Clear();
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}
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b->Add((void*)i);
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if (b->Count() == max_count) {
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CHECK_GT(b->Count(), 0);
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sci->free_list.push_back(b);
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b = nullptr;
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}
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}
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if (b) {
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CHECK_GT(b->Count(), 0);
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sci->free_list.push_back(b);
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}
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}
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ByteMap possible_regions;
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SizeClassInfo size_class_info_array[kNumClasses];
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};
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